Question: What was Yuri Lotman a member of starting 1977?
Paraphrase: Yuri Lotman joined what in 1977?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q360084 p:P463 ?s . ?s ps:P463 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1977')) }